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/*

 * INET         An implementation of the TCP/IP protocol suite for the LINUX

 *              operating system.  INET  is implemented using the  BSD Socket

 *              interface as the means of communication with the user level.

 *

 *              Definitions for the Forwarding Information Base.

 *

 * Authors:     A.N.Kuznetsov, <kuznet@ms2.inr.ac.ru>

 *

 *              This program is free software; you can redistribute it and/or

 *              modify it under the terms of the GNU General Public License

 *              as published by the Free Software Foundation; either version

 *              2 of the License, or (at your option) any later version.

 */

#ifndef _NET_IP_FIB_H

#define _NET_IP_FIB_H

#include <linux/config.h>

struct kern_rta

{

        void            *rta_dst;

        void            *rta_src;

        int             *rta_iif;

        int             *rta_oif;

        void            *rta_gw;

        u32             *rta_priority;

        void            *rta_prefsrc;

        struct rtattr   *rta_mx;

        struct rtattr   *rta_mp;

        unsigned char   *rta_protoinfo;

        unsigned char   *rta_flow;

        struct rta_cacheinfo *rta_ci;

};

struct fib_nh

{

        struct net_device               *nh_dev;

        unsigned                nh_flags;

        unsigned char           nh_scope;

#ifdef CONFIG_IP_ROUTE_MULTIPATH

        int                     nh_weight;

        int                     nh_power;

#endif

#ifdef CONFIG_NET_CLS_ROUTE

        __u32                   nh_tclassid;

#endif

        int                     nh_oif;

        u32                     nh_gw;

};

/*

 * This structure contains data shared by many of routes.

 */

struct fib_info

{

        struct fib_info         *fib_next;

        struct fib_info         *fib_prev;

        int                     fib_treeref;

        atomic_t                fib_clntref;

        int                     fib_dead;

        unsigned                fib_flags;

        int                     fib_protocol;

        u32                     fib_prefsrc;

        u32                     fib_priority;

        unsigned                fib_metrics[RTAX_MAX];

#define fib_mtu fib_metrics[RTAX_MTU-1]

#define fib_window fib_metrics[RTAX_WINDOW-1]

#define fib_rtt fib_metrics[RTAX_RTT-1]

#define fib_advmss fib_metrics[RTAX_ADVMSS-1]

        int                     fib_nhs;

#ifdef CONFIG_IP_ROUTE_MULTIPATH

        int                     fib_power;

#endif

        struct fib_nh           fib_nh[0];

#define fib_dev         fib_nh[0].nh_dev

};

#ifdef CONFIG_IP_MULTIPLE_TABLES

struct fib_rule;

#endif

struct fib_result

{

        unsigned char   prefixlen;

        unsigned char   nh_sel;

        unsigned char   type;

        unsigned char   scope;

        struct fib_info *fi;

#ifdef CONFIG_IP_MULTIPLE_TABLES

        struct fib_rule *r;

#endif

};

#ifdef CONFIG_IP_ROUTE_MULTIPATH

#define FIB_RES_NH(res)         ((res).fi->fib_nh[(res).nh_sel])

#define FIB_RES_RESET(res)      ((res).nh_sel = 0)

#else /* CONFIG_IP_ROUTE_MULTIPATH */

#define FIB_RES_NH(res)         ((res).fi->fib_nh[0])

#define FIB_RES_RESET(res)

#endif /* CONFIG_IP_ROUTE_MULTIPATH */

#define FIB_RES_PREFSRC(res)            ((res).fi->fib_prefsrc ? : __fib_res_prefsrc(&res))

#define FIB_RES_GW(res)                 (FIB_RES_NH(res).nh_gw)

#define FIB_RES_DEV(res)                (FIB_RES_NH(res).nh_dev)

#define FIB_RES_OIF(res)                (FIB_RES_NH(res).nh_oif)

struct fib_table

{

        unsigned char   tb_id;

        unsigned        tb_stamp;

        int             (*tb_lookup)(struct fib_table *tb, const struct rt_key *key, struct fib_result *res);

        int             (*tb_insert)(struct fib_table *table, struct rtmsg *r,

                                     struct kern_rta *rta, struct nlmsghdr *n,

                                     struct netlink_skb_parms *req);

        int             (*tb_delete)(struct fib_table *table, struct rtmsg *r,

                                     struct kern_rta *rta, struct nlmsghdr *n,

                                     struct netlink_skb_parms *req);

        int             (*tb_dump)(struct fib_table *table, struct sk_buff *skb,

                                     struct netlink_callback *cb);

        int             (*tb_flush)(struct fib_table *table);

        int             (*tb_get_info)(struct fib_table *table, char *buf,

                                       int first, int count);

        void            (*tb_select_default)(struct fib_table *table,

                                             const struct rt_key *key, struct fib_result *res);

        unsigned char   tb_data[0];

};

#ifndef CONFIG_IP_MULTIPLE_TABLES

extern struct fib_table *local_table;

extern struct fib_table *main_table;

static inline struct fib_table *fib_get_table(int id)

{

        if (id != RT_TABLE_LOCAL)

                return main_table;

        return local_table;

}

static inline struct fib_table *fib_new_table(int id)

{

        return fib_get_table(id);

}

static inline int fib_lookup(const struct rt_key *key, struct fib_result *res)

{

        if (local_table->tb_lookup(local_table, key, res) &&

            main_table->tb_lookup(main_table, key, res))

                return -ENETUNREACH;

        return 0;

}

static inline void fib_select_default(const struct rt_key *key, struct fib_result *res)

{

        if (FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)

                main_table->tb_select_default(main_table, key, res);

}

#else /* CONFIG_IP_MULTIPLE_TABLES */

#define local_table (fib_tables[RT_TABLE_LOCAL])

#define main_table (fib_tables[RT_TABLE_MAIN])

extern struct fib_table * fib_tables[RT_TABLE_MAX+1];

extern int fib_lookup(const struct rt_key *key, struct fib_result *res);

extern struct fib_table *__fib_new_table(int id);

extern void fib_rule_put(struct fib_rule *r);

static inline struct fib_table *fib_get_table(int id)

{

        if (id == 0)

                id = RT_TABLE_MAIN;

        return fib_tables[id];

}

static inline struct fib_table *fib_new_table(int id)

{

        if (id == 0)

                id = RT_TABLE_MAIN;

        return fib_tables[id] ? : __fib_new_table(id);

}

extern void fib_select_default(const struct rt_key *key, struct fib_result *res);

#endif /* CONFIG_IP_MULTIPLE_TABLES */

/* Exported by fib_frontend.c */

extern void             ip_fib_init(void);

extern void             fib_flush(void);

extern int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);

extern int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);

extern int inet_rtm_getroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);

extern int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb);

extern int fib_validate_source(u32 src, u32 dst, u8 tos, int oif,

                               struct net_device *dev, u32 *spec_dst, u32 *itag);

extern void fib_select_multipath(const struct rt_key *key, struct fib_result *res);

/* Exported by fib_semantics.c */

extern int              ip_fib_check_default(u32 gw, struct net_device *dev);

extern void             fib_release_info(struct fib_info *);

extern int              fib_semantic_match(int type, struct fib_info *,

                                           const struct rt_key *, struct fib_result*);

extern struct fib_info  *fib_create_info(const struct rtmsg *r, struct kern_rta *rta,

                                         const struct nlmsghdr *, int *err);

extern int fib_nh_match(struct rtmsg *r, struct nlmsghdr *, struct kern_rta *rta, struct fib_info *fi);

extern int fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event,

                         u8 tb_id, u8 type, u8 scope, void *dst, int dst_len, u8 tos,

                         struct fib_info *fi);

extern int fib_sync_down(u32 local, struct net_device *dev, int force);

extern int fib_sync_up(struct net_device *dev);

extern int fib_convert_rtentry(int cmd, struct nlmsghdr *nl, struct rtmsg *rtm,

                               struct kern_rta *rta, struct rtentry *r);

extern void fib_node_get_info(int type, int dead, struct fib_info *fi, u32 prefix, u32 mask, char *buffer);

extern u32  __fib_res_prefsrc(struct fib_result *res);

/* Exported by fib_hash.c */

extern struct fib_table *fib_hash_init(int id);

#ifdef CONFIG_IP_MULTIPLE_TABLES

/* Exported by fib_rules.c */

extern int inet_rtm_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);

extern int inet_rtm_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);

extern int inet_dump_rules(struct sk_buff *skb, struct netlink_callback *cb);

extern u32 fib_rules_map_destination(u32 daddr, struct fib_result *res);

#ifdef CONFIG_NET_CLS_ROUTE

extern u32 fib_rules_tclass(struct fib_result *res);

#endif

extern u32 fib_rules_policy(u32 saddr, struct fib_result *res, unsigned *flags);

extern void fib_rules_init(void);

#endif

static inline void fib_combine_itag(u32 *itag, struct fib_result *res)

{

#ifdef CONFIG_NET_CLS_ROUTE

#ifdef CONFIG_IP_MULTIPLE_TABLES

        u32 rtag;

#endif

        *itag = FIB_RES_NH(*res).nh_tclassid<<16;

#ifdef CONFIG_IP_MULTIPLE_TABLES

        rtag = fib_rules_tclass(res);

        if (*itag == 0)

                *itag = (rtag<<16);

        *itag |= (rtag>>16);

#endif

#endif

}

extern void free_fib_info(struct fib_info *fi);

static inline void fib_info_put(struct fib_info *fi)

{

        if (atomic_dec_and_test(&fi->fib_clntref))

                free_fib_info(fi);

}

static inline void fib_res_put(struct fib_result *res)

{

        if (res->fi)

                fib_info_put(res->fi);

#ifdef CONFIG_IP_MULTIPLE_TABLES

        if (res->r)

                fib_rule_put(res->r);

#endif

}

#endif  /* _NET_FIB_H */